Princeton Tec QUAD LED 78 Lumen Headlamp. The Quad Headlamp is the lightest in Princeton Tec’s line of regulated-LED headlamps and weighs only 96 grams including its three AAA batteries . Four Ultrabright LEDs power through the darkest conditions and are safe inside a tough waterproof housing that will survive severe impacts and water submersion up to 1 meter. The wide beam of the Quad is perfect for tasks around camp and is bright enough for technical scrambles and brisk runs on dark trails. Weight conscious users will love the Quad’s sophisticated circuitry that allows the use of lithium AAA batteries and reduces the Quad’s weight to 82 grams. This light has regulated LEDs for a consistent light output as well as a battery power meter to let you know when its time to change batteries.